In what scenario might a patrol need to change its planned route?

A patrol may need to change its planned route primarily when enemy activity is reported. This adjustment is crucial for maintaining operational security and the safety of the patrol members. If there is an indication of enemy presence, the original route may become hazardous, exposing the patrol to ambushes or engagement. By altering the route, the patrol can avoid potential conflicts and remain stealthy, allowing them to complete their mission objectives more effectively.

In scenarios involving favorable weather, running low on supplies, or losing communication, while these factors do impact mission planning and execution, they do not pose an immediate threat that necessitates a change in route as directly as enemy activity does. Adjusting for weather might improve conditions, supplies can often be managed or supplemented without altering the route, and changes in communication protocols might not require a patrol to divert from its planned path.